Sensitivity Analysis of the Optimum Performance of Conventional Load-Frequency Control

This paper deals with the determination of optimum parameter values of conventional load-frequency regulation of interconnected power systems. It is shown that the control performance is rather insensitive to changes of the parameters in the vicinity of their optimum values. On the other hand the optimum value of the bias parameter depends strongly on the weighting factors used in the penalty function, as well as on the numerical data of the power system model. The importance of such sensitivity considerations is discussed in connection with the recommendation made by Elgerd and Fosha to have a bias setting which is lower than the natural frequency characteristic of the controlled area.